Belarusian police using truncheons arrested more than 100 opposition protestors in the capital Minsk Friday, Interfax news agency reported. The marchers were demonstrating in support of politician Mikhail Marinich, and other opposition protestors imprisoned by the government or thought to have been killed by the KGB. Belarusian legal authorities sentenced Marinich to five years hard labour for alleged theft three months ago. Demonstrators brandished banners labelling Belarusian President Aleksander Lukashenko a dictator, and demanding the government find the killers of Dmitry Zavadsky, a television cameraman who disappeared five years ago. Police using clubs attacked the crowd at an entrance to Minsk's central Oktiabrsky square. Injured included human rights activists Valeriy Shchukin and Viacheslav Sivshchik. Sivshchik appeared particularly badly hurt as police continued beating him after knocking him to the ground, witnesses said. --More 2345 Local Time 2045 GMT